@@ -419,6 +419,10 @@ func (b *Builder) processImageFrom(img builder.Image) error {

 	onBuildTriggers := b.runConfig.OnBuild

 	b.runConfig.OnBuild = []string{}

+	// Reset stdin settings as all build actions run without stdin

+	b.runConfig.OpenStdin = false

+	b.runConfig.StdinOnce = false

+

 	// parse the ONBUILD triggers by invoking the parser

 	for _, step := range onBuildTriggers {

 		ast, err := parser.Parse(strings.NewReader(step), &b.directive)